<!doctype html>
<html>

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>html-sketchapp - Opacity</title>
  <style>
    .box {
      width: 100px;
      height: 100px;
      background: red;
    }
  </style>
</head>

<body>
  <div class='box' style='opacity: 0.8'>opacity 0.8</div>
  <div class='box' style='opacity: 0.3'>opacity 0.3</div>
</body>

</html>
